Bag-turning machine.



D. F. STEIN.

BAG TURNING MACHINE.

APPLICATION FILED June. 1916. RENEWED 05c. 24.1911.

Patented July 2, 1918.

3 SHEETSSHEET I.

Inventor:

Atty

01F. STEIN.

BAG TURNING MACHINE V APBLICATION FILED lULY8| I916. RENEWED DECJZMJBH- Patented July 2,1918.

3 SHEETSSHEET 2- JIIIILI /l lllllllllllmllllll l k "1 Lommsam IN VEN TOR.

ATTORNEY.

TNE NDRIHS PBI'ERS cm. rnoro-umm. wAsumamm n. r;

D. F. STEIN. I

BAG TURNING MACHINE.

APPLICATION FILED JULY 8. 1916- RENEWED DEC. 24,1917.

Patented July 2,1918.

3 SHEETSSHEET 3- IN V EN TOR.

ATTORNEY:

DAVID IF. STEIN, OF MONTREAL, CANADA.

BAG-TURNING MAoHin'n.

1,2mfi93.

Application filed July 8, 1916', Serial No. 108,112.

To all whom z't may concern:

Be it known that I, DAVID F. STEIN, a subject of the King of Great Britain and Ireland, residing at Montreal, Canada, have invented certain new and useful Improvements in Bag-Turning Machines, of which the following is a specification.

My invention relates to improvements in machines for turning bags, such as burlap and jute bags or the like.

Bags of the character herein contemplated are manufactured in large quantities, and each consists of two like parts sewed together at three edges. The bags are sewed on the wrong side, so that before they can be used they are required to be completely turned, and my machine is adapted to perform this work.

In United States Letters Patent N 0. 1,140,627 issued to me on May th, 1915,

- there is disclosed a machine for turning bags, and the present invention is a development of that shown in my said patent.

The principal object of the present invention is to provide a machine of greatly increased efficiency in regard to the output within a given period of time. I accomplish this object by an improved construction and operation of the bag holding and turning mechanism.

-Another object of the invention is to so construct the machine that its parts are adjustable to adapt'it for operation upon.

different sized bags.

A still further object of the invention is to simplify and improve sundry parts and combinations of parts whereby the machine may be constructed at a relatively low cost and will be thoroughly accurate, rapid, and generally satisfactory in operation.

Stated briefly in general terms, a machine constructed according to my invention embodies holding means by which the bags are suspended by their upper edges, together with rotating members which are designed to engage the bag, free it from the holding members, and. turn the bag in the course of their rotation. The bag holding members are preferably mounted to be capable of reciprocation so that as a bag is taken by the turning members from a supporting member the latter moves into a position to have another bag placed thereon. In this Way the machine can be worked continuously and its output considerably increased over that of the machine disclosed in my ear i rpa ent.

Specification of Letters Patent.

Patented July 2, 191%.

Renewed December 24, 1917. Serial No. 208,702.

The preferred form of the invention is illustratively exemplified in the accompanying drawing, in which Figure 1 is a perspective view of my improved bag turning machine;

Fig. 2 is a vertical sectional view through the mechanism for adjusting the turning arms in relation to each other;

Fig. 3 is a similar view on the line 33 of Fig. 2;

Fig. 4 is a rear elevational view of the bag holding or supporting mechanism and appurtenant parts;

Fig. 5 is a front elevational view thereof adapted particularly to disclose the reciprocating means for the bag holding mechanism;

Fig. 6 is a vertical sectional view on the line 6 6 of Fig. 4:;

Fig. 7 is a side elevational view of a block carrying gripper jaws adapted to engage the upper edges or mouths of the bags;

Fig. 8 is a fragmentary sectional view of one of the turning arms showing a cam therein for closing the gripper jaws of Fig. 7- and Fig. 9 is a similar-view showing a cam for opening said jaws.

The machine illustrated in its present embodiment comprises a preferably horizontal frame which is designated generally as 10 and supports the entire operative mechanism. At one end of the frame 10 is arranged gearing and driving mechanism which is designated generally as 11 and will not be specifically be necessary for the explanation of the operation of special parts of the machine. At its opposite end the frame 10 carries a train of gears 12 adapted to rotate a roller 13 over which an endless apron 14 passes, on to which apron the bags fall, after having been turned, as will be more fully hereinafter explained. 15 denotes a presser roller resting upon the apron 14- and designed to press the bags as they are carried upwardly on the upper reach of the apron 14:. The lowermost wheel of the gear train 12 is driven by any suitable means, not shown'in the drawings.

Projecting from the base of the frame 10 1s a supporting pillar 16 provided with a bearing 17 at its upper end. This bearing is designed to receive the rotary supporting member for the turning arms. Within the beari g 17 i moun ed r tatably a l e 18 described except as may which has secured thereto by means of screws 19 or the like a sleeve or ring: 20'

having formed integrally therewith a bevel gear wheel 21. The ends of the: 20. are adapted to rotate between and be guided by" the blocks or: lugs. I"? forming part. of: the bearing 17 The sleeve 18 is substantially cylindrical and incloses a pair of similar blocks 22. each of which has a central threaded opening to receive a screw spindle 23, which is threaded in opposite directions at eachside, of its median line or center. liraddition to supporting the screw spindle 23, the blocks have the function ofi'tightly holding within the sleeve 18a plurality of rods 24. In. the drawing, four such rods areshowmprojecting in pairs in opposite directions beyond the ends of the sleeve 18.v Those ends ofv the rods 24: which are. within the sleeve lr8 are held in position by means of. screws 25 entering the rods axially and abutting; the adjacent endsv ofthe blocks 22., Aswill be noted particularly from Figs: 2' and. 3,.the blocks 22" are provided with semi-cylindrical grooves, and the inner face of the sleeve I8 is provided with compl'emental semi-cylindrical, grooves, each pair. of grooves in the block and sleeve respectively being adapted to form. a. seat to receive one ofthe rods 24'.

There is a, driving fit. between the. rods 24 and blocks 22, whereby the rods will move with: the blocks in the sleeve 18;

At their projecting ends the rods 24 engage blocks 26, such rods being firmly held in the blocks by means of the countersunk screws 27. Additionalmeans for; preventing the rods 24 from working. loose in the blocks 26 are, provided in the form of'caprplates 28 securedby' screws 29 against the outer. faces of the blocks 26. Each block, 26 i'srcentrally aperturechsuch apertures being designed to receive the ends of'the spindle 23. Theopposite ends of'the spindle 23' arelsquared as at for. the purpose of receiving a suitably shaped socket of an operating crank. 30. The cap plates 28'are orificed. to permit the crank to engage the squared, ends of; the screw threaded spindle. I

Projecting radially from each block 26 is a plurality of" bag turning arms 31'. Any desired number off arms. may be employed. In the drawing each block 26' is shown as carrying three such arms,.the: arms in. the opposite hlocksbei'ng alined so. as to form parallelpairs of bag;turningmembers. The

arms 31 are preferably set in sleeves or sockets 32 which are suitably secured in. the b1o;cks"26, as' is more especially illustrated in Fig. 2.

Rotation is imparted to the blocks 2.6 through the intermediary of a beveledf gear 33', which meshes with: the gear 21 'formed" as an integral part .Of-thesleeVeZO. The gear 33 is carried at one end of a vertically inclined shaft 3%,. the opposite end of which (Fig. 5) carries a bevel gear wheel 85 in mesh witlr a bevel gear wheel 36 fast on a stub shaft 37 driven from the power source 11.

Each arm Slis hollow, having a. ball or k110b38' at its free end", such arm being also preferably somewhat curved its free end. As will be noted from Fig. 1,. each arm SL is provided with a lateral slot 39 extending substantially the entire length of the arm.

Slidahle in each arm3l is agripping member (Fig. 7) which: comprises a substantially cylindrical block 40 carrying: a pair o l" gripper jaws. The lower jaw all is stationary and preferably formed integral with the block 40, while the upper jaw l2 pivotally mounted at 4:3, and' has a rea-rwardly extending tail? or arm l'el capable of projecting through an elongated slot (not shown) in the body of'block 40. The jaws are normally held apart by a coiled spring l5 interposed therebet'ween.

Mounted on a pin 16, in the block 40, is a flat spring 47, which, under conditions to be exglainechis adapted to move under the extended' arm 44 of the jaw. 42, and hold the latter in gripping engagement with the Each block .40 is pivotally connected by means of a stud 418 near its rear end with one end of a rod t9, the other end of which is loosely pivoted about a stub shaft 50 held in a bracket 51' projecting upwardly from the frame 10. This stub'shaft also carries or supports an arm 52 the-innerend of which is provided with a collar 53 (Fig, which fits into a rectangular groove formed at the outer face of the block 26' and steadies the latter duringits rotation. Within each arm 31, near its outer end' is a cam 54- which is so shaped as to be capable of engaging the under face of the extended arm M of the jaw 42. and forcing. the latter downwardly into engagement with. the jaw 41. When. the two gripper jawsare in engagement, having been placed in this position by cotiperation of: the extension. 454:.Witli the cam 5 L, the fi'at spring. 4C7 passes under t'heextensionwl land maintainsthe. gripper jaws in engagement.

Near the, inner end of each arm 31. is a second cam.55 which is longer and: lower than thecam 54.. and: the function of which is to press the that spring 4L7: aside-seas to permit thecoiled. spring 45- to. extend and separate thegripperjaws; In Fig. 7 theopened position'ofthe jaws is indicated inv full lines and the engaging position in dottedlines.

. The bags supporting, mechanism is arranged at the forward'end of'the machine in such'positi'on as to present the mouths of. the bags to the turning arms as the latter rotate. The preferred arrangement of parts of the Bag supporting mechanism willnow be de- -'minimize friction.

56 1s open, and pro ectmg through the open haraeos is a troughfshaped guide 56 in which is adapted to reciprocate a. carriage 57, the latter moving back and forth onrollers 58 to The rear end of theguide mg therem is a portion of the carriage 57 into which isdove tailed the lower nd 59 of the bag supporting uprights. The lower end of each I whichjis a spri-ng tongue 61 totemporarily member." I 1 Each of the uprights '59 is provided near hold thelbag' in position on the supporting i 'its lower end with a transverse threaded flopenmg through "which extends a "screw 1 means ofwhiehthe spindle Aswill benoted1trom Fig.4 the spindle is spindle62 the opposite ends of which are squared'a-s'at' 63 to receive a suitable tool by may be rotated.

preferably formedof sections heldtogether,

" end toe'nd, by a plurality of sleeves 64.

The frontof theguide 56-isslottedat 65 and projecting through the slot is a stlld 66 secured to the carriage; 57. Pivotallyiicom .nected with the'stud 66is one end of a link 67, the'otherend offsaid link being pivotall *1 connected to an arm 68 which pivots at-69 on' a bracket 1-70 forming part ofthe machine fran'ie Intermediate its ends theFarm 68 is pivotally connectedat'71Ftoone end of a bar 7 2 the oppositeend of which is pivotally con Y nected at'7 to arelatively short arm 74,

rigidly mounted ,ona shaft 75. On said shaft 75 is a beveled gear 7 6 injmeshfwith a similar gear 77 securedto'thestub' shaft 37. The retracted and--advanced positions, re

spectively, of the carriage 5 '7'\ vith its bag 7.

As the arms 31 pass up between ad acent arms 60 the'gripping jaws 41 42wi1l engage supporting arms are indicated'bydotted and full lines in Fig. 5. I Projecting upwardly from the base of the lel to the pillar 16 is of which is to strip a bag from the arms 31 if such bag does not fall by gravity on to the apron 14.

It will be understood that bags are of different standard widths, and my machine is adapted for turning bags of diflerent widths ranging from the minimum to the maximum. In the course of operation, as will be presently described, each of the turning arms 31 moves between a pair of adjacent arms 60 of the bag supporting members, and it is therefore necessary to adjust the distance between the pairs of bag supporting members and the pairs of arms 31 in correspondence. To adjust the space between the pairs of arms 31 it is merely necessary to rotate the screw spindle 23 in the desired direction whereby the arms 31 will be drawn either closer together or moved farther apart. lhe

ing members 59, 60," it

bag supporting upright comprises spacedbent arms 60 ad acent one ofeach of the device isas out, are hung with their upper edges overlapping the upperends or two pairs of the 111g from these arms prevents the 'bag 111g substantially papal. v a rod 7 the function spindle 23'havinga righthand and aloft hand thread it willbe understood that the arms31 onopposite sides of the center of directions by actuation of said To adjustthe' space between the supportis simply-necessary to rotatethe spmdle 6:2 to tl'le 'desired extent crank 30.

and in the desired direction by means of the Assuming that thej adjustments have been made as above suggested. the operation of follows z- The bags, inside spaced arms'60, thejbodyof the bag depend- The spring l'ongue 61 from falling foifthe arms. The turning arms 31 are'caus edjto revolve through the intermeshing gearing 21jand 33 and the mechanism which rotates this gearmg. a The carriage 57 1s 'reclproc'ated in" the guidef56 through the beveled gears 76and 77 and the'link mechanism'showi'i inFig. 5.

There are suitable dwellsin therecipiocatory movement of the carriage :57 to permit the arms 31'to take the bags from the arms 60. "These dwells occur duringthe period that the short arm 74'moves-idly downward in the arcofa'circle from substantially the positionshown in Fig. 5 to the corresponding positionbelofw the shaft 37, and during the period thatthe ,arm 74 moves idly upward at the'left hand sideof the shaft 75.

"Asthe arms 31"rise the rods 49 will cause the block 40and the grippingpmechanism which it supportsto bemovedjto vard the forward ends of the arms 31. r The gripping jaws Q41 and 42- through the lateral slots 39 in the armsl31.

the overlapped ends of the bags held on the the horizontal the cam 54 will close the jaws 41 42 and grip the bag, and in the continued rotary travel of the arms 31 the bag will be drawn down over its arms by the gripper jaws. It being borne in mind that the block 40 is pivotally connected to the rod and that the latter is considerably shorter than the arm 31, the are of the circle described by the outer end of each rod 49 will be considerably smaller than that described by the outer end of each rod 31, so that it is apparent that as both the arms 31 and bars 49 rotate the bag will be completely turned. Each adjacent pair of supporting members 59, 60 sup ports a single bag and each parallel pair project outwardly of arms 31 is designed to turn a single bag.

and turned aside thus permitting the spring 45 to extend and separate the jaws 41 and 42, and on the further rotation of such pair,

of arms, and when the latter are directed at i a downwardly inclined angle, the bag will fall from the arms 31 by gravity on to the traveling apron 14 and be carried to any desired place. If for any reason the bag should not fall by gravity from the arms 81 high speed and while in the drawing I have shown 3 pairs of turning arms upon a single center, and a number of supporting arms appropriate to the turning arms, it will be readily apparent that the turning arms may be multiplied in pairs as desired and the supporting members correspondingly multiplied. The machine illustrated in the drawing may can with ease place bags on the supporting members 59, 60 as rapidly as these can be taken and turned by the rotating arm 31.

What I claim is 1. In a machine of scribed, the combination of bag supporting mechanism reciproeable in a rectilinear path transversely of the machine and bag turning mechanism rotatable in a plane substantially at right angles to the path of reciprocation of the bag supporting mechanism.

2. In a machine of the character de scribed, the combination of bag supporting mechanism comprising spaced arms, means for reciprocating said armsin a rectilinear path,rotary arms adapted toreceive bags from said supporting mechanism, means carbe served by a single operator, who

the character deried by and cooperable with said rotary arms to engage bags and turn the same, and means for rotating the rotary arms in a plane substantially at r1ght angles to the path of reciprocation of the bag supporting arms in a plane substantially at right angles to the path of reciprocation of the carriage.

4. In a machine of the character described, the combination of reciprocatory bag supporting mechanism comprising spaced arms, means for adjusting the distance between said arms, means for reciprocating said bag supporting mechanism in a rectilinear path, bag turning mechanism comprising rotary arms and means for adjusting the distance between said rotary arms, and means for rotating said bag turning mechanism in a plane substantially at right angles to the path of reciprocation of said bag supporting mechanism.

5. In a machine of the character described, the combination of bag supporting mechanism, means for reciprocating the same in a rectilinear path, bag turning mechanism, and means for rotating the same in a plane at right angles to the path of reciprocation of said ba supporting mechanism.

In witness whereof I have hereunto set my hand in the presence of two witnesses. 1 DAVID F. STEIN.

Witnesses:

S. B. GORDON, W. FIRESTONE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

v Washington, D. 0. 

